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security garage CO detector photoelectric smoke sensor door contact sensor RoHS compliant 24/7 monitoring alarm flood detection system PIR motion sensor home security kit export IoT home protection water leak sensor interlinked alarms LTE cellular alarm LP gas alarm property safety monitoring DIY home security Smart Home Security Hub panic button pendant fire safety villa security kit apartment alarm system wholesale safety devices CE certified smoke alarm basement water sensor outdoor siren strobe UL listed detector window break detector wireless smart home system gas leak detector smart gateway hub PIR motion sensor PIR Motion Sensor smart home security DIY home security stove shut off device backup battery alarm Zigbee smoke detector senior safety alarm FCC approved detector river water level monitoring cooling tower level monitor ATEX explosion-proof level sensor well water level sensor export level measurement ultrasonic level sensor NB-IoT level meter float level switch 4-20mA 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